Have i upset the radiator gods?

I just fitted a new boiler, which worked fine apart from a dodgy TRV
on one of the rads which i have changed today, all other radiators
were working fine. After refilling the system(i had had cleanser
running through system) and firing up the boiler i now have a radiator
that does not heat up, although prior to draining it worked. The pipe
to the valve is hot, as is the valve itself and radiator tail, but the
rad itself is stone cold. What has happened in the period of time
from emptying the system and refilling it?
And yes i have bled every radiator.

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